Mathematical balance



FIG. 1 is a perspective view of the mathematical balance with two weights;

FIG. 2 is a perspective view of part of the mathematical balance;

FIG. 3 is an exploded perspective view of an arm of the mathematical balance; and,

FIG. 4 is an exploded perspective view of the base and central support of the mathematical balance. 

The ornamental design for a mathematical balance, shown and described. 